Nchinda Nchinda
MIT grad, ethereum developer, bitcoin user
Spectroscopy
- IR
- UV-Vis
- Florescence
- NMR
NMR
IR
UV-Vis
Florescence
UV-Vis
- 400nm-700nm range
- Energy range of molecular orbitals
Infrared
- 700nm -1mm range
- Molecular vibrational Energy
Florescence
- < .01nm
- analogous to absorbtion
- energy of band gaps
NMR
- Nuclear Magnetic Resonance
- 10m - 100m
- spin energy measurement
Experiment 3
length of a molecule
Molecules of Interest
Anthracene
Napthalene
Napthacene
Bohr Model
Conjugated π system
- delocalized electrons
- quantized energy levels
Particle in a Box
When Classical Becomes Quantum
Derivation
- wavelength -> frequency
- frequency -> energy
- energy -> length
Procedure
- measure background spectra
- measure sample
Results
Experiment 6
functional group determination
Fourier Transforms
- not just for course 6
Interferometer
Procedure
- measure background spectra
- measure sample
Results
refer to paper copies
Experiment 8
magnetic spin decay
Decay
- Γ - total spin decay rate
- γ_2^* - pure dephasing (homogeneous)
- γ_1 - damping (homogeneous)
- Δ - inhomogeneous dephasing
Physical Aspect of Decay
- γ_2^* - lost through collisions with conserved energy
- γ_1 - decay excited state to ground state
- Δ - change in phase due to the environment
<magnetic field illustration>
<spin decay and waves diagram>
Glycerol
Experiment Procedure
- Total Decay
- Spin Echo
- Inversion Recovery
5.351 Oral
By Nchinda Nchinda
